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r=40CM=0,4M
V=108 km =30m/s
h
szukane
f=?
rozwiazanie
108*1000m
3600s skreslasz 2 zera
V=2pir*f
przekształcasz wzór
f=V
2pi *r
f=30m/s
2,314*0,4m
metry ci sie skracaja
=30s
6,28*0,4
=30s
2,512
=11,9=11s